Knee Pain from Guillain-Barre?

  : : My son, whom is now 11 yrs old, had Guillain-Barre when he was 18 mths old brought on by a severe case of mono.  He was affected from waist down and his left arm only. (no upper paralysis)  To this day, ALWAYS preceeding an illness, viral or bacterial, he complains of knee pain for approx. 1 week. (sorry-his only discription is tanks playing army in his knee).  His pediatrician has sent him for numerous testing, RA, Lupas, etc... all of which show nothing.  The last bout was last month.  Knee hurt-pain awakening him also at night-then strep throat and pink eye.  The pain goes away, except for excessive activities, (he plays baseball), not to return till the next illness.   It took 1 1/2 years for the reflexes to come back, is it possible the sheath never healed correctly?  Or maybe a lifelong lingering side effect?  I have searched all the Guillian sites, and have come across nothing like this.  His pediatrician is also at a loss, and asked me to forward any info you may be able to offer.  Thank-you for your help.
  : : Tina
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I am glad the information was helpful. Thanks for the feedback. CCF MD mdf.